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Submission #304650

# Submission time Handle Problem Language Result Execution time Memory
304650 2020-09-21T16:46:44 Z galca Counting Mushrooms (IOI20_mushrooms) C++14
91.8699 / 100
 10 ms 384 KB 
#include "mushrooms.h"
#include "iostream"

using namespace std;

vector<int> knownZeros;
vector<int> knownOnes;
vector<int> alternating;

void resolveAlternating(int lastVal) {
	if (alternating.size() > 0) {
		if (lastVal == -1) {
			lastVal = use_machine({ 0, alternating[alternating.size()-1] });
		}
		else {
			alternating.pop_back();
			lastVal ^= 1;
		}

		while (alternating.size() > 0) {
			if (lastVal) {
				knownOnes.push_back(alternating[alternating.size() - 1]);
			}
			else {
				knownZeros.push_back(alternating[alternating.size() - 1]);
			}
			lastVal ^= 1;
			alternating.pop_back();
		}
	}
}

int count_mushrooms(int n) {
	knownZeros.push_back(0);
	// find one more, or two 1s
	int i = 1;
	while ((knownZeros.size() < 2) && (knownOnes.size() < 2)) {
		int c = use_machine({ 0, i });
		if (c) {
			knownOnes.push_back(i);
		}
		else {
			knownZeros.push_back(i);
		}
		++i;
		if (i == n) {
			return knownZeros.size();
		}
	}

	vector<int> fives;
	bool isZero = false;

	if (knownZeros.size() == 2) {
		fives.push_back(0);
		fives.push_back(knownZeros[0]);
		fives.push_back(0);
		fives.push_back(knownZeros[1]);
		fives.push_back(0);
		isZero = true;
	}
	else {
		fives.push_back(0);
		fives.push_back(knownOnes[0]);
		fives.push_back(0);
		fives.push_back(knownOnes[1]);
		fives.push_back(0);
	}

	while ((knownZeros.size() + alternating.size() + knownOnes.size()) < 200) {
		if (i == n) {
			resolveAlternating(-1);
			return knownZeros.size();
		}
		if (i == (n - 1)) {
			int c = use_machine({ 0, n - 1 });
			resolveAlternating(c);
			return knownZeros.size() + 1 - c;
		}
		if (i == (n - 2)) {
			int c = use_machine({ 0, n - 1 });;
			resolveAlternating(c);
			int c1 = use_machine({ 0, n - 2 });;
			return knownZeros.size() + 2 - c1 - c;
		}

		fives[0] = i;
		fives[2] = i + 1;
		fives[4] = i + 2;
		int c = use_machine(fives);

		switch (c) {
			case 0:
				if (isZero) {
					knownZeros.push_back(i);
					knownZeros.push_back(i+1);
					knownZeros.push_back(i+2);
					resolveAlternating(0);
				}
				else {
					knownOnes.push_back(i);
					knownOnes.push_back(i + 1);
					knownOnes.push_back(i + 2);
					resolveAlternating(1);
				}
				i += 3;
				break;
			case 1:
				if (isZero) {
					knownZeros.push_back(i+1);
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 2);
				}
				else {
					knownOnes.push_back(i + 1);
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 2);
				}
				i += 2;
				break;
			case 2:
				if (isZero) {
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 1);
					alternating.push_back(i + 2);
				}
				else {
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 1);
					alternating.push_back(i + 2);
				}
				i += 2;
				break;
			case 3:
				if (isZero) {
					knownOnes.push_back(i+1);
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 2);
				}
				else {
					knownZeros.push_back(i + 1);
					if (alternating.size() == 0) {
						alternating.push_back(i);
					}
					alternating.push_back(i + 2);
				}
				i += 2;
				break;
			case 4:
				if (isZero) {
					knownOnes.push_back(i);
					knownOnes.push_back(i + 1);
					knownOnes.push_back(i + 2);
					resolveAlternating(1);
				}
				else {
					knownZeros.push_back(i);
					knownZeros.push_back(i + 1);
					knownZeros.push_back(i + 2);
					resolveAlternating(0);
				}
				i += 3;
				break;
		}
	}

	resolveAlternating(-1);
	i = knownZeros.size() + knownOnes.size();

	int totalZeros = knownZeros.size();

	while (i < n) {
		vector<int> m;
		if (knownOnes.size() >= knownZeros.size()) {
			
			for (int j = 0; j < knownOnes.size(); j++) {
				if ((i + j) < n) {
					m.push_back(knownOnes[j]);
					m.push_back(i + j);
				}
			}
			i += knownOnes.size();
			int c = use_machine(m);
			if (c & 1) {
				++totalZeros;
				--c;
				knownZeros.push_back(m[m.size() - 1]);
			}
			else {
				knownOnes.push_back(m[m.size() - 1]);
			}
			totalZeros += c / 2;
			
		}
		else {
			for (int j = 0; j < knownZeros.size(); j++) {
				if ((i + j) < n) {
					m.push_back(knownZeros[j]);
					m.push_back(i + j);
				}
			}
			i += knownZeros.size();
			int c = use_machine(m);
			if (c & 1) {
				++c;
				knownOnes.push_back(m[m.size() - 1]);
			}
			else {
				knownZeros.push_back(m[m.size() - 1]);
			}
			totalZeros += (m.size() - c) / 2;
			
		}
	}
	return totalZeros;
}

Compilation message

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:186:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  186 |    for (int j = 0; j < knownOnes.size(); j++) {
      |                    ~~^~~~~~~~~~~~~~~~~~
mushrooms.cpp:206:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  206 |    for (int j = 0; j < knownZeros.size(); j++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
91.8699 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 7 ms 384 KB Output is correct
8 Correct 7 ms 288 KB Output is correct
9 Correct 7 ms 384 KB Output is correct
10 Correct 8 ms 256 KB Output is correct
11 Correct 7 ms 256 KB Output is correct
12 Correct 8 ms 256 KB Output is correct
13 Correct 7 ms 384 KB Output is correct
14 Correct 6 ms 256 KB Output is correct
15 Partially correct 7 ms 256 KB Output is partially correct
16 Partially correct 6 ms 380 KB Output is partially correct
17 Correct 5 ms 256 KB Output is correct
18 Correct 8 ms 376 KB Output is correct
19 Partially correct 7 ms 256 KB Output is partially correct
20 Correct 9 ms 256 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Partially correct 8 ms 256 KB Output is partially correct
23 Correct 6 ms 376 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Partially correct 10 ms 256 KB Output is partially correct
26 Partially correct 7 ms 384 KB Output is partially correct
27 Correct 7 ms 256 KB Output is correct
28 Partially correct 9 ms 384 KB Output is partially correct
29 Partially correct 7 ms 256 KB Output is partially correct
30 Partially correct 8 ms 256 KB Output is partially correct
31 Partially correct 10 ms 384 KB Output is partially correct
32 Partially correct 7 ms 256 KB Output is partially correct
33 Partially correct 6 ms 376 KB Output is partially correct
34 Partially correct 9 ms 256 KB Output is partially correct
35 Partially correct 7 ms 384 KB Output is partially correct
36 Partially correct 8 ms 384 KB Output is partially correct
37 Partially correct 8 ms 256 KB Output is partially correct
38 Partially correct 9 ms 256 KB Output is partially correct
39 Partially correct 8 ms 384 KB Output is partially correct
40 Partially correct 8 ms 256 KB Output is partially correct
41 Partially correct 8 ms 256 KB Output is partially correct
42 Partially correct 7 ms 256 KB Output is partially correct
43 Partially correct 9 ms 256 KB Output is partially correct
44 Partially correct 7 ms 384 KB Output is partially correct
45 Partially correct 9 ms 256 KB Output is partially correct
46 Partially correct 7 ms 256 KB Output is partially correct
47 Partially correct 7 ms 256 KB Output is partially correct
48 Partially correct 9 ms 256 KB Output is partially correct
49 Partially correct 7 ms 256 KB Output is partially correct
50 Partially correct 8 ms 256 KB Output is partially correct
51 Partially correct 8 ms 256 KB Output is partially correct
52 Partially correct 7 ms 256 KB Output is partially correct
53 Partially correct 9 ms 256 KB Output is partially correct
54 Partially correct 9 ms 256 KB Output is partially correct
55 Partially correct 9 ms 256 KB Output is partially correct
56 Partially correct 7 ms 384 KB Output is partially correct
57 Partially correct 8 ms 256 KB Output is partially correct
58 Partially correct 6 ms 380 KB Output is partially correct
59 Partially correct 7 ms 256 KB Output is partially correct
60 Partially correct 7 ms 256 KB Output is partially correct
61 Partially correct 7 ms 256 KB Output is partially correct
62 Correct 1 ms 320 KB Output is correct
63 Correct 1 ms 256 KB Output is correct
64 Correct 0 ms 256 KB Output is correct
65 Correct 1 ms 256 KB Output is correct
66 Correct 0 ms 256 KB Output is correct
67 Correct 1 ms 256 KB Output is correct
68 Correct 0 ms 256 KB Output is correct
69 Correct 1 ms 256 KB Output is correct
70 Correct 1 ms 256 KB Output is correct
71 Correct 1 ms 256 KB Output is correct
72 Correct 1 ms 256 KB Output is correct
73 Correct 1 ms 256 KB Output is correct
74 Correct 0 ms 256 KB Output is correct
75 Correct 1 ms 256 KB Output is correct
76 Correct 0 ms 256 KB Output is correct
77 Correct 0 ms 256 KB Output is correct
78 Correct 0 ms 256 KB Output is correct
79 Correct 0 ms 256 KB Output is correct
80 Correct 0 ms 256 KB Output is correct
81 Correct 1 ms 256 KB Output is correct
82 Correct 1 ms 256 KB Output is correct
83 Correct 0 ms 256 KB Output is correct
84 Correct 0 ms 256 KB Output is correct
85 Correct 1 ms 256 KB Output is correct
86 Correct 0 ms 256 KB Output is correct
87 Correct 1 ms 256 KB Output is correct
88 Correct 0 ms 256 KB Output is correct
89 Correct 0 ms 256 KB Output is correct
90 Correct 0 ms 256 KB Output is correct
91 Correct 1 ms 256 KB Output is correct